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Commit 251a8cfe authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'please-pull-pstore_mevent' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux 

Pull pstore fixes from Tony Luck:
 "Patch series to allow EFI variable backend to pstore to hold multiple
  records."

* tag 'please-pull-pstore_mevent' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
  efi_pstore: Add a format check for an existing variable name at erasing time
  efi_pstore: Add a format check for an existing variable name at reading time
  efi_pstore: Add a sequence counter to a variable name
  efi_pstore: Add ctime to argument of erase callback
  efi_pstore: Remove a logic erasing entries from a write callback to hold multiple logs
  efi_pstore: Add a logic erasing entries to an erase callback
  efi_pstore: Check remaining space with QueryVariableInfo() before writing data
parents 70f2836d f94ec0c0

drivers/acpi/apei/erst.c

+8 −8
Original line number Diff line number Diff line
@@ -931,14 +931,14 @@ static int erst_check_table(struct acpi_table_erst *erst_tab) 


static int erst_open_pstore(struct pstore_info *psi);

static int erst_close_pstore(struct pstore_info *psi);

static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,

static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, int *count,

			   struct timespec *time, char **buf,

			   struct pstore_info *psi);

static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason,

		       u64 *id, unsigned int part,

		       u64 *id, unsigned int part, int count,

		       size_t size, struct pstore_info *psi);

static int erst_clearer(enum pstore_type_id type, u64 id,

			struct pstore_info *psi);

static int erst_clearer(enum pstore_type_id type, u64 id, int count,

			struct timespec time, struct pstore_info *psi);



static struct pstore_info erst_info = {

	.owner		= THIS_MODULE,
@@ -987,7 +987,7 @@ static int erst_close_pstore(struct pstore_info *psi) 
	return 0;

}



static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,

static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, int *count,

			   struct timespec *time, char **buf,

			   struct pstore_info *psi)

{
@@ -1055,7 +1055,7 @@ out: 
}



static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason,

		       u64 *id, unsigned int part,

		       u64 *id, unsigned int part, int count,

		       size_t size, struct pstore_info *psi)

{

	struct cper_pstore_record *rcd = (struct cper_pstore_record *)
@@ -1101,8 +1101,8 @@ static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason, 
	return ret;

}



static int erst_clearer(enum pstore_type_id type, u64 id,

			struct pstore_info *psi)

static int erst_clearer(enum pstore_type_id type, u64 id, int count,

			struct timespec time, struct pstore_info *psi)

{

	return erst_clear(id);

}

drivers/firmware/efivars.c

+114 −49
Original line number Diff line number Diff line
@@ -658,13 +658,14 @@ static int efi_pstore_close(struct pstore_info *psi) 
}



static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,

			       struct timespec *timespec,

			       int *count, struct timespec *timespec,

			       char **buf, struct pstore_info *psi)

{

	efi_guid_t vendor = LINUX_EFI_CRASH_GUID;

	struct efivars *efivars = psi->data;

	char name[DUMP_NAME_LEN];

	int i;

	int cnt;

	unsigned int part, size;

	unsigned long time;
@@ -674,10 +675,30 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, 
			for (i = 0; i < DUMP_NAME_LEN; i++) {

				name[i] = efivars->walk_entry->var.VariableName[i];

			}

			if (sscanf(name, "dump-type%u-%u-%lu", type, &part, &time) == 3) {

			if (sscanf(name, "dump-type%u-%u-%d-%lu",

				   type, &part, &cnt, &time) == 4) {

				*id = part;

				*count = cnt;

				timespec->tv_sec = time;

				timespec->tv_nsec = 0;

			} else if (sscanf(name, "dump-type%u-%u-%lu",

				   type, &part, &time) == 3) {

				/*

				 * Check if an old format,

				 * which doesn't support holding

				 * multiple logs, remains.

				 */

				*id = part;

				*count = 0;

				timespec->tv_sec = time;

				timespec->tv_nsec = 0;

			} else {

				efivars->walk_entry = list_entry(

						efivars->walk_entry->list.next,

						struct efivar_entry, list);

				continue;

			}



			get_var_data_locked(efivars, &efivars->walk_entry->var);

			size = efivars->walk_entry->var.DataSize;

			*buf = kmalloc(size, GFP_KERNEL);
@@ -685,11 +706,11 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, 
				return -ENOMEM;

			memcpy(*buf, efivars->walk_entry->var.Data,

			       size);

				efivars->walk_entry = list_entry(efivars->walk_entry->list.next,

			efivars->walk_entry = list_entry(

					efivars->walk_entry->list.next,

					struct efivar_entry, list);

			return size;

		}

		}

		efivars->walk_entry = list_entry(efivars->walk_entry->list.next,

						 struct efivar_entry, list);

	}
@@ -698,26 +719,77 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, 


static int efi_pstore_write(enum pstore_type_id type,

		enum kmsg_dump_reason reason, u64 *id,

		unsigned int part, size_t size, struct pstore_info *psi)

		unsigned int part, int count, size_t size,

		struct pstore_info *psi)

{

	char name[DUMP_NAME_LEN];

	char stub_name[DUMP_NAME_LEN];

	efi_char16_t efi_name[DUMP_NAME_LEN];

	efi_guid_t vendor = LINUX_EFI_CRASH_GUID;

	struct efivars *efivars = psi->data;

	struct efivar_entry *entry, *found = NULL;

	int i, ret = 0;

	u64 storage_space, remaining_space, max_variable_size;

	efi_status_t status = EFI_NOT_FOUND;



	spin_lock(&efivars->lock);



	sprintf(stub_name, "dump-type%u-%u-", type, part);

	sprintf(name, "%s%lu", stub_name, get_seconds());

	/*

	 * Check if there is a space enough to log.

	 * size: a size of logging data

	 * DUMP_NAME_LEN * 2: a maximum size of variable name

	 */

	status = efivars->ops->query_variable_info(PSTORE_EFI_ATTRIBUTES,

						   &storage_space,

						   &remaining_space,

						   &max_variable_size);

	if (status || remaining_space < size + DUMP_NAME_LEN * 2) {

		spin_unlock(&efivars->lock);

		*id = part;

		return -ENOSPC;

	}



	sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count,

		get_seconds());



	for (i = 0; i < DUMP_NAME_LEN; i++)

		efi_name[i] = name[i];



	efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES,

				   size, psi->buf);



	spin_unlock(&efivars->lock);



	if (size)

		ret = efivar_create_sysfs_entry(efivars,

					  utf16_strsize(efi_name,

							DUMP_NAME_LEN * 2),

					  efi_name, &vendor);



	*id = part;

	return ret;

};



static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,

			    struct timespec time, struct pstore_info *psi)

{

	char name[DUMP_NAME_LEN];

	efi_char16_t efi_name[DUMP_NAME_LEN];

	char name_old[DUMP_NAME_LEN];

	efi_char16_t efi_name_old[DUMP_NAME_LEN];

	efi_guid_t vendor = LINUX_EFI_CRASH_GUID;

	struct efivars *efivars = psi->data;

	struct efivar_entry *entry, *found = NULL;

	int i;



	sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count,

		time.tv_sec);



	spin_lock(&efivars->lock);



	for (i = 0; i < DUMP_NAME_LEN; i++)

		efi_name[i] = stub_name[i];

		efi_name[i] = name[i];



	/*

	 * Clean up any entries with the same name

	 * Clean up an entry with the same name

	 */



	list_for_each_entry(entry, &efivars->list, list) {
@@ -726,11 +798,22 @@ static int efi_pstore_write(enum pstore_type_id type, 
		if (efi_guidcmp(entry->var.VendorGuid, vendor))

			continue;

		if (utf16_strncmp(entry->var.VariableName, efi_name,

				  utf16_strlen(efi_name)))

			continue;

		/* Needs to be a prefix */

		if (entry->var.VariableName[utf16_strlen(efi_name)] == 0)

				  utf16_strlen(efi_name))) {

			/*

			 * Check if an old format,

			 * which doesn't support holding

			 * multiple logs, remains.

			 */

			sprintf(name_old, "dump-type%u-%u-%lu", type,

				(unsigned int)id, time.tv_sec);



			for (i = 0; i < DUMP_NAME_LEN; i++)

				efi_name_old[i] = name_old[i];



			if (utf16_strncmp(entry->var.VariableName, efi_name_old,

					  utf16_strlen(efi_name_old)))

				continue;

		}



		/* found */

		found = entry;
@@ -738,37 +821,17 @@ static int efi_pstore_write(enum pstore_type_id type, 
					   &entry->var.VendorGuid,

					   PSTORE_EFI_ATTRIBUTES,

					   0, NULL);

		break;

	}



	if (found)

		list_del(&found->list);



	for (i = 0; i < DUMP_NAME_LEN; i++)

		efi_name[i] = name[i];



	efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES,

				   size, psi->buf);



	spin_unlock(&efivars->lock);



	if (found)

		efivar_unregister(found);



	if (size)

		ret = efivar_create_sysfs_entry(efivars,

					  utf16_strsize(efi_name,

							DUMP_NAME_LEN * 2),

					  efi_name, &vendor);



	*id = part;

	return ret;

};



static int efi_pstore_erase(enum pstore_type_id type, u64 id,

			    struct pstore_info *psi)

{

	efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi);



	return 0;

}

#else
@@ -782,7 +845,7 @@ static int efi_pstore_close(struct pstore_info *psi) 
	return 0;

}



static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,

static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, int *count,

			       struct timespec *timespec,

			       char **buf, struct pstore_info *psi)

{
@@ -791,13 +854,14 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, 


static int efi_pstore_write(enum pstore_type_id type,

		enum kmsg_dump_reason reason, u64 *id,

		unsigned int part, size_t size, struct pstore_info *psi)

		unsigned int part, int count, size_t size,

		struct pstore_info *psi)

{

	return 0;

}



static int efi_pstore_erase(enum pstore_type_id type, u64 id,

			    struct pstore_info *psi)

static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,

			    struct timespec time, struct pstore_info *psi)

{

	return 0;

}
@@ -1237,6 +1301,7 @@ efivars_init(void) 
	ops.get_variable = efi.get_variable;

	ops.set_variable = efi.set_variable;

	ops.get_next_variable = efi.get_next_variable;

	ops.query_variable_info = efi.query_variable_info;

	error = register_efivars(&__efivars, &ops, efi_kobj);

	if (error)

		goto err_put;

fs/pstore/inode.c

+5 −2
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ struct pstore_private { 
	struct pstore_info *psi;

	enum pstore_type_id type;

	u64	id;

	int	count;

	ssize_t	size;

	char	data[];

};
@@ -175,7 +176,8 @@ static int pstore_unlink(struct inode *dir, struct dentry *dentry) 
	struct pstore_private *p = dentry->d_inode->i_private;



	if (p->psi->erase)

		p->psi->erase(p->type, p->id, p->psi);

		p->psi->erase(p->type, p->id, p->count,

			      dentry->d_inode->i_ctime, p->psi);



	return simple_unlink(dir, dentry);

}
@@ -270,7 +272,7 @@ int pstore_is_mounted(void) 
 * Load it up with "size" bytes of data from "buf".

 * Set the mtime & ctime to the date that this record was originally stored.

 */

int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,

int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,

		  char *data, size_t size, struct timespec time,

		  struct pstore_info *psi)

{
@@ -306,6 +308,7 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, 
		goto fail_alloc;

	private->type = type;

	private->id = id;

	private->count = count;

	private->psi = psi;



	switch (type) {

fs/pstore/internal.h

+1 −1
Original line number Diff line number Diff line
@@ -50,7 +50,7 @@ extern struct pstore_info *psinfo; 
extern void	pstore_set_kmsg_bytes(int);

extern void	pstore_get_records(int);

extern int	pstore_mkfile(enum pstore_type_id, char *psname, u64 id,

			      char *data, size_t size,

			      int count, char *data, size_t size,

			      struct timespec time, struct pstore_info *psi);

extern int	pstore_is_mounted(void);

fs/pstore/platform.c

+7 −6
Original line number Diff line number Diff line
@@ -136,7 +136,7 @@ static void pstore_dump(struct kmsg_dumper *dumper, 
			break;



		ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part,

				    hsize + len, psinfo);

				    oopscount, hsize + len, psinfo);

		if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted())

			pstore_new_entry = 1;
@@ -173,7 +173,7 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c) 
			spin_lock_irqsave(&psinfo->buf_lock, flags);

		}

		memcpy(psinfo->buf, s, c);

		psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, c, psinfo);

		psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, 0, c, psinfo);

		spin_unlock_irqrestore(&psinfo->buf_lock, flags);

		s += c;

		c = e - s;
@@ -197,7 +197,7 @@ static void pstore_register_console(void) {} 


static int pstore_write_compat(enum pstore_type_id type,

			       enum kmsg_dump_reason reason,

			       u64 *id, unsigned int part,

			       u64 *id, unsigned int part, int count,

			       size_t size, struct pstore_info *psi)

{

	return psi->write_buf(type, reason, id, part, psinfo->buf, size, psi);
@@ -267,6 +267,7 @@ void pstore_get_records(int quiet) 
	char			*buf = NULL;

	ssize_t			size;

	u64			id;

	int			count;

	enum pstore_type_id	type;

	struct timespec		time;

	int			failed = 0, rc;
@@ -278,9 +279,9 @@ void pstore_get_records(int quiet) 
	if (psi->open && psi->open(psi))

		goto out;



	while ((size = psi->read(&id, &type, &time, &buf, psi)) > 0) {

		rc = pstore_mkfile(type, psi->name, id, buf, (size_t)size,

				  time, psi);

	while ((size = psi->read(&id, &type, &count, &time, &buf, psi)) > 0) {

		rc = pstore_mkfile(type, psi->name, id, count, buf,

				  (size_t)size, time, psi);

		kfree(buf);

		buf = NULL;

		if (rc && (rc != -EEXIST || !quiet))